(((millicent))) This is just going to take some time to work itself out. Your D may sense that there is something up with your H and that is why she wants to spend more time with him at the moment. I bet once she figures out the situation, she may not be so eager to spend so much time with him.
Try to breathe and not let this consume your every thought. This is just going to take some time but you know you will work through this.